Safety device for presses.



B. LEVI.

SAFETY DEVICE FOR PRESSES.

APPLICATIUN FILED 0013. 1914.

1,155,745. Patented 00a. 5, 1915.

2 SHEETSSHEET l.

B. LEVI.

SAFETY DEVICE FOR PRESSES.

v APPLICATION FILED 0CT.3. 1914. 1,155,745. Patented 001;. 5, 1915.

" SHEETSSHEET 2 IIIH HHH BENJAMIN LEVI, on NEW YORK, N. Y.

SAFETY DEVICE FOR PRESSES.

Specification of Letters Patent.

Patented a. 5, 1915.

Application filed October 3, 1914. Serial No. 864,790.

To all whom it may concern:

Be it known that I, BENJAMIN LEVI, a citizen of the United States, and a resident of New York, county and State of New York, have invented new and useful Improvements in Safety Devices for Presses, of which the following is a specification.

This invention relates to safety devices for punching and other presses and comprises a safety guard adapted to move in front of the entrance to the press tool, a trip rod controller carried by the guard arm, held away from the trip rod when the guard is in inactive position and positively engaged with the trip rod when the guard is down in active position and means, as a treadle. connected to the trip rod controller for setting the guard at safety and then actuating the trip rod. These with other features of construction will now be described by referencehad to the accompanying drawings, in which:

Figure 1 is a side'elevation of a press with the safety trip device of this invention applied thereto, with the safety guard in upper inactive position. Fig. 2 is an end view of the safety device on an enlarged scale. Fig. 3 is an elevation of the device showing the guard down in active position. Fig. 4 is a plan view of the same, partly in section, and Fig. 5 illustrates a modification of the trip rod controller.

The guard 6 which extends in front of the press is adjustably connected to the bar 7 located at the side of the press. This bar is secured to an arm 8 having a bored hub by which it rocks on a stud 9, which projects from a plate 10 adapted to be fastened to the side of the press. Bar 7 may be a part of the arm-8. Between an extension at the rear of the arm 8 and any suitable part of the press is a spring 12, whose function is to counter-balance the arm and guard anditalso tends to hold the guard in inactive position, as shown in Fig. 1. The movement of the guard to inactive position is arrested by the extension 11 contacting with an adjustable screw 13 held in a lug projecting from the plate 10. Another lug 14 determines the downward safety posit-ion of the guard. as shown at Fig. 3. The clutch trip rod 15 is provided with the usual lifting spring and has at its lower end a plug 16 fitted to slide in a lug 17 extending from the plate 10; this plug 16 has a flange 18 at its lower end formed as shown, by a circular groove cut in the plug. The clutch trip rod is normally isolated, that is. it has no positive connection with the operating means of the press. it is indirectly connected thereto only when the guard arm is in protecting position. As a further means for holding the trip rod up. and prevent accidental movement of the same, a latch 19 may be used 'adapted to enter the groove in the plug 16 or pass under the flange at its end when the trip rod is in upper position. This latch 19 is pivoted to the plate 10 at 20 and is pressed toward the plug 16 by a spring 21; it also has an extension, shown as an adjustable screw 22. by means of which it may be moved away from the plug 16 to free the trip rod, as hereafter described.

The trip rod controller, or means by which itis directly actuated, is carried by the guard arm in such manner as to be held away from the trip rod. positively out of action therewith, when the guard arm is in upper position away from the entrance to the operating tool of the press, and is brought into position to actuate the trip rod only when the guard arm is fully down in protective position guarding the entrance to the press tool. This trip rod controller consists of a rod 23 fitted to slide in a bore formed at about right angles to the arm 8; its upper end is provided with a head 24 and its lower end beneath the arm with an eye connection to which is attached the operating means of the press. shown in the drawings as a treadle 26 and a connecting rod 27 and a spring 28, whose function is to raise and hold the treadle 26 and its attached parts in upper position. the eye connection of the rod 23 then being in contact with the under side of the ar 8 with the guard in upper inactive posi ion, the head 24.- of the controller is then clear of the plug 16 of the trip rod at one side thereof, as'shown in Figs. 1 and 5' and in dotted lines in Fig. 3. A spring 29may be interposed between the head 24. and the arm 8 to hold the controller up until the guard is in guarding position, see Fig. 5. The strength of this spring exceeds that of the spring 12 so that when the treadle 26 is depressed the guard is moved into safety position, bringing the head 24 over the flange18 of the trip rod, and then the rod 23 is moved down, sliding in the arm 8, carrying with it the trip rod and so causing the press to be actuated. The head 24 as it moves over the flange 18 strikes the extension 22 of the latch 19 and moves the latch away from the plug 16 of the trip rod 15, leaving the trip rod free of the latch.

In the preferred construction of this invention, shown in the main views of the drawings, the head 24 of the trip rod controller rests in its backward position on the upper edge of a guide plate 30 secured by screws to the plate 10. This upper edge is circular, its center being the axis of motion of the guard arm 8. The under side of the head 24 has a correspondingly circular groove 31. The forward side or edge 32 of the guide plate 30 is vertical or parallel wvith the line of motion of the trip rod.

Now, by this construction it will be observed that the trip rod cannot possibly be actuated by the treadle before the guard is in safety position, as the trip rod controller does not engage with the trip rod until its head 24 has moved over the upper edge of the guide plate 30 ready to slide down against the edge 32, the guard then being down in safety position and the head 24 over the flange 18 of the plug 16 of the trip rod 15. At this time the head 24 has pushed the latch 19 away from the plug 16 and a continued downward movement of the treadle pulls the trip rod down and so releases the press clutch. This downward movement of the controller is arrested by its head 24 coming in contact with the stop block 33. When the treadle is released the rod 23 of the controller is moved upwardly in the arm 8, and as head 24 slides up against the edge 32 of the guide plate the trip rod is raised and the latch 19 is again pressed forward by its spring to positively hold the trip rod in inoperative position, the guard 6 being raised by its spring or by the eye connection 25 of the rod 23 and the head 24 slides over the top of the guide plate 30away from the trip rod.

It will be observed that the spring 12 may be eliminated from the system if the spring 28 of the treadle be made sufficiently strong to raise the guard as well as the treadle, as the eye 25 of the rod 23 contacts with the underside of the arm 8 and will so remain until the head 24 is in position to again slide down along the edge 32 of the guide plate 30.

It is apparent that changes in the construction and I arrangement of the various parts of this safety trip device may be made to suit different kinds of presses, retaining all the essential features of this invention.

I claim:

1. A safety device for presses, comprising a guard extending from an arm and adapted to move in front of the entrance to the press tool, a normally free and unconnected clutch trip rod, a trip rod controller movably conu nected to the guard arm normally held away from the trip rod and operating means connected to the controller, whereby the controller is brought into position to act on the trip rod when the guard is moved into safety position and is then caused to actuate the trip rod.

2; A safety device for presses, comprising a guard extending from an arm and adapted to move in front of the entrance to the press tool, a clutch trip rod, a trip rod controller movably connected to the guard arm unconnected with and normally held away from the trip rod, means for permitting movement of the controller relative to the guard arm only when the controller engages the trip rod and operating means connected to the controller.

3. A safety device for presses, comprising a guard extending from a pivoted arm and adapted to move in front of theentrance to the press tool. a clutch trip rod, a trip rod controller slidably connected to the guard arm, means for permitting movement of the controller relative to the guard arm only when the controller engages the trip rod and operating means connected to the controller.

4. A safety device for presses, comprising a guard extending from an arm and adapted to move in front of the entrance to the press tool, a press trip rod normally free and unconnected, a trip rod controller movably connected to the guard arm, operating means connected to the controller and means for holding-the controller away from the trip rod and immovable relative to the guard arm when the guard is moving into and out of safety position.

5. A safety device for presses, comprising a g uard extending from an arm and adapted to move in front of the entrance to the press tool, a press trip rod, a trip rod controller movably connected to the guard arm and normally held away from the trip rod, means for locking the trip rod in inactive position and adapted to be disengaged therefrom by the controller and operating means connected to the controller.

6. A safety device for presses, comprising a guard extending from a pivoted arm and adapted to move in front of the entrance to the press tool, a clutch trip rod, a trip rod controller slidably connected to the guard arm, means for holding the controller immovable relative to the guard arm when the guard is moving into and out of safety'position and permitting it to move only when the controller engages the trip rod, means for lock ng the trip rod in inactive position and adapted to be disengaged therefrom by the controller and a spring actuated operatmg means connected to the controller nor.- inally holding the parts in inoperative posi- 7. A safety device for presses, comprising a guard extending from a movable arm and adapted to move in front of the entrance to the press tool, a normally free and unconnected clutch trip rod, a trip rod controller movably connected to the guard arm normally held away from the trip rod, a treadle and a rod connecting it to the controller.

8. A safety device for presses, comprising a guard extending from a pivoted arm and adapted to move in front of the entrance to the press tool, a counterbalancing spring connected to the guard arm, a clutch trip rod, a trip rod controller slidably connected to the guard arm and an operating means connected to the controller and adapted to set and hold the guard and controller in inoperative positions.

9. In a safety device for presses, the com bination with the clutch trip rod having a flange at its lower end and the press operating means, of a pivoted arm and a guard carried thereby, a trip rod controller com prising a rod fitted to slide in the pivoted arm and having a head .at its upper end, a connection between the lower end of said rod and the press operating means and a guide plate over the upper edge of which the head of the controller slides as it moves awav from the flange of the trip rod and as the guard is moving into and out of safety position.

10. In a safety device for presses, the combination with the clutch trip rod having a flange at its lower end and the press operating means, of a pivoted arm and a guard carried thereby, counterbalancing spring connected to the pivoted arm, a trip rod controller con'iprising a rod fitted to slide in the pivoted arm and having a head at its upper end, a connection between the lower end of said rod and the press operating means and a guide plate over the upper edge of which the head of the controller slides as it moves toward and from the flange of the trip rod and as the guard is moving into and out of safety position.

11. In a safety device for presses, the con'ibination with the clutch trip rod having a flange at its lower end and the press operating means, of a pivoted arm, a guard carried thereby, a stop for determining the lower safety position of the arm and a stop for determining the upper position of the arm. a trip rod controller comprising a rod fitted to slide in the pivoted arm and having a head on its upper end, a connection between the lower end of said rod and the operating means and a guide over the upper edge of which the head of the controller slides it moves away from the flange of the trip rod and as the guard is moving into and out of safety position.

12. in a safety device for presses, the combination with the clutch trip rod having a flange at its lov end'and a spring actuated operating arms, of a pivoted arm, a

guard carried thereby, a trip rod controller comprising a rod fitted to slide in the pivoted arm having a head at its upper end and an eye at its lower end adapted to contact with the under Side of the arm, a connection between said eye and the press operating means and a guide plate over the upper edge of which the head of the controller slides as it moves away from the flange of the trip rod'and as the guard is moving into and out of safety position.

13. In a safety device for presses, the combination with the clutch trip rod having a flange at its lower end and the press operating means, of a pivoted arm and a guard carried thereby, a trip rod controller comprising a rod fitted to slide in the pivoted arm and having ahead at its upper end, a connection between the lower end of said rod and the press opera-ting means and a guide plate over the upper end of which the head of the controller slides as it moves away from the flange of the trip rod and as the guard is moving into and out of safety position, said guide plate having an edge parallel with the line of movement of the trip rod and over which the head of the controller slides when said head is acting on the flange of the trip rod with the guard in safety position.

14. In a safety device for presses, the combination with the clutch trip rod'having a flange at its lower end and the press operating means, of a pivoted arm and a guard carried thereby, a. trip rod controller comprising a rod fitted to slide in the pivoted arm and having a head at its upper end. a connection between the lower end of said rod and the press operating means, a guide plate over the upper edge of which the head of the controller slides as it moves toward and from the trip rod and as the guard is moving into and out of safety position and a spring actuated latch adapted to lock the trip rod and to be moved away therefrom by the controller when its head moves over the flange of the trip rod.

15. In a safety device for presses, the combination with the clutch trip rod having a flange at its lower end an operating means, a pivoted arm, and a guard carried thereby, of a trip rod controller comprising a rod tted to slide in the pivoted arm and having a head at its upper end and an eye at its lower end adapted to contact with the under side of the arm, a connection between said eye and the press opera-ting means, a guide plate for the controller having its upper edge circular and concentric with the axis of the arm and also having an edge parallel with the line of movement of the trip rod and a spring actuated latch adapted to lock the trip rod in safety position.

18. A press having an isolated trip rod in combination with means for guarding the press tool, a treadle connected to the guard- In testimony whereof, I have hereunto ing means, and a trip rod controller norsubscribed my name this 25th day of Sep mally held away from the trip rod and tember, 1914.

actuated by the treadle to constitute a con- BENJAMIN LEVI. 5 nection between the trip rod and the treadle In the presence of' after the guarding means has been set into WM. J. DOLAN,

full guarding position by the treadle. JAMES A. HUDSON. 

